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#advent of code 2020
#day 19
import re
def FindRule(r,d):
if d >20: return "";
elif type(rules[r]) == str:
return rules[r];
else:
suboptions = [];
for subset in rules[r]:
subopt = "(";
for sr in subset:
subopt += FindRule(sr,d+1);
subopt += ")";
suboptions.append(subopt);
return "(" + "|".join(suboptions) + ")";
rules = dict();
PuzzleInput = open("19.in","r").read().split("\n\n");
rules_raw = PuzzleInput[0].split("\n");
messages = PuzzleInput[1].split("\n");
for rule in rules_raw:
rule_i, rule_vals = rule.split(": ");
rule_i = int(rule_i);
if rule_vals[0] == '"':
rules[rule_i] = rule_vals[1];
else:
rules[rule_i] = [[int(r) for r in subrule.split(" ")] for subrule in rule_vals.split(" | ")];
TotalRule = "";
TotalRule = FindRule(0,0);
regsearch = re.compile(TotalRule);
p1 = 0;
for message in messages:
message = message.replace("\n","");
regfind = regsearch.fullmatch(message);
if regfind != None:
p1+=1;
print("part 1 =",p1);
#part 2: change of rules 8 and 11
rules[8] = [[42], [42, 8]];
rules[11] = [[42,31], [42,11,31]];
TotalRule = "";
TotalRule = FindRule(0,0);
p2 = 0;
for countdown,message in enumerate(messages):
#print(len(messages) - countdown, len(messages));
message = message.replace("\n","");
regfind = re.findall(TotalRule+"+",message);
if regfind:
for x in regfind:
if message in x:
p2+=1;
break;
print("part 2 =",p2);
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